INACON Glossary

PRI

Abbreviation for Primary Rate Interface

A Primary Rate Interface
is a ISDN (Integrated Services Digital Network) term describing either an E1 circuit in Europe or a T1 circuit in North America. It consists of up to 23 (for T1 lines) and 30 (for E1 lines) 64 kbps B channels and one 64 kbps D channel.